LLM Comparison

Phi 4 vs Step 3.5 Flash

Side-by-side specs, pricing & capabilities · Updated April 2026

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2/6 models
Same tier:
 
P
Phi 4
S
Step 3.5 Flash
OrganizationMicrosoftStepFun
OpenTools Score
FamilyPhiStep
StatusCurrentCurrent
Release DateJan 2025Jan 2026
Context Window16K tokens262K tokens
Input Price$0.07/M tokens$0.10/M tokens
Output Price$0.14/M tokens$0.30/M tokens
Capabilities
textcode
textcode
Max Output16K tokens66K tokens
API Identifiermicrosoft/phi-4stepfun/step-3.5-flash
 View Phi 4View Step 3.5 Flash

Cost Calculator

Enter your expected monthly token usage to compare costs.

ModelInputOutputTotal / movs Best
Phi 4Cheapest$0.07$0.07$0.14—
Step 3.5 Flash$0.10$0.15$0.25+85%

Microsoft

Phi 4

Phi 4 is a large language model from Microsoft. Supports up to 16,384 token context window. Available from $0.07/M input tokens.

StepFun

Step 3.5 Flash

Step 3.5 Flash is a large language model from StepFun. Supports up to 262,144 token context window. Available from $0.10/M input tokens.

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